It remained on top of KukriKhans post no matter if I scrolled down or even clicked on it. Unlike most flash advertisements this one doesn't has a close button. I am getting the urge to contact a hacker and sabotage their site, but alas I do not know hackers... anyone?

I am using Firefox by the way and normally I don't have a single popup at the Org. I opened a new tab to upload the screenshot and when I got back the ad was gone.

Is there something we can do to prevent this kind of advertisements?